The bass is the place...

Iy is true you need multiple bass transducers like a powered sub to get bass right across a room.

However most speakers only can get the the rest right in a single sweet spot so a single sub can serve well for that as well.

To get it all right across a large area one needs very wide dispersion or Omni speakers to start with else the solution is not complete.

Yup the extra work needed to produce bass coupled with how our ears work makes for a double whammy.  

As frequency decreases the work that must be done to maintain flat response increases exponentially. Bigger rooms magnify the task even more. It’s basic physics.

In many cases it is the amp that is not up to the task of driving the speakers properly especially in the bass where it must work much harder, without clipping ie distortion. That’s why powered subs and affordable and very compact and efficient high power Class D amps are both the bees knees these days, especially as more people have space and budget considerations and demand smaller more manageable products including speakers.